Problem emulating IButtons :

Thanks for your fast reply ! I will test this out !

Relatedly, how tolerant are the iButton pins of electrically out-of-spec locks / readers? How easy or difficult would it be for an over voltage (but basically functional) lock to damage a Flipper?

Also, are the voltages to emulate the same as for read/write ?

Is it possible for a hardware fault to prevent emulating but allow read/write or as long as if the device can read/write it should be able to emulate as well unless the “problem” is on the software side or the readers not accepting the emulation ?

Some locks might not deal well with emulation and i only have 2 kind of locks with ibutton to test so my problem of not be able to emulate might even be lock related. At any way i want to discard the possibility of hardware fault. Is there any voltage mesures that i can take with multimeter while emulating to discard hardware fault ? Or if reading/writing possible this is enought to discard hardware fault ?

Hi, today also tried with stock firmware to emulate iButton, but yes it didn’t work.
Maybe the ground pin not good enough and needs stronger spring and a little bit extended length to have better contact.
Maybe I can easily fix it at home?

Making an ideal connector is impossible, we made the best one we could. It it doesn’t make proper contact you might need to clean the reader itself, we’ve heard reports of that helping

There’s no thing as a working but out-of-spec reader. If the voltage is too high then even the original key won’t work.

Read/write voltages can be the same or different, depends on the key. However, if the reading works, then the emulation should also work.

Ok, thanks for the clarification.
On my case it’s not a problem with contacts as they are properly made with the reader, it’s just that emulation simply doesn’t work with the type of readers that i have.
The question about voltage were more on the lines of a broken reader that would have over-voltage that would toast/damage both flipper and keys, so i wouldn’t stick the flipper on a random reader at least without testing with a key first, just in case …
I will try to find other readers to test with.

Yes connector is good, but I think pins should be stronger, they presses very easy, I think springs should be stronger. It will be easier to use when Domophone is a little bit dirty.
Yesterday I tried to client it, but it didn’t help. I’m will try one more time later again.

Some readers have an anti-emulator feature that we are not yet bypassing. Yours probably is one of those.

Basically, they start reading the key, then remove the power for a bit, then start reading it again. If the key doesn’t start from the beginning of its data then it’s an emulator and should be ignored. We can fix this in our software, it just takes time and our iButton/RFID dev is currently busy with RFID RAW

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The pin strength doesn’t matter, as they will either be fully extended, or compressed because the reader itself pushes on them, they can’t just be both compressed and not touching anything

Ok, thanks for letting me know.

OK, thx.
I’m testing with Vizit, as i see iButton is very old technologu and most new ones start using RFID or even NFC, but NFC fob looks same as RFID one.


No progress…

After all this time, does anybody know how to fix this bug?

Good afternoon. Faced the same problem. I can read the key. Write down too. But when you try to emulate the key, the 1-wire line is pulled up to the power supply and that’s it. I tried on the original firmware and on non-original. When using the ibutton fuzer application, the ds1990 emulation does not work, while the metacom and cyfral keys emulate.

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First, I can’t reproduce pulling 1W pin to +5 when emulating DS1990, but that can be question of voltmeter’s internal resistance. Second, you should get a copy of Dallas iButton spec, as it’s way more complex than outputting stream of bits forever.

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Good day everyone.
Just made a little board with tact switch to short 1W-pin with GND. I’m pushing it while keeping Flipper pins connected to reader. It helps a lot with Vizit intercoms.

I bet it can be performed in software. Developers, attention please!

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